Method of filling holes in metal parts.



E. BORMAN.

METHOD OF FILLING HOLES IN METAL PARTS.

APPLICATION FILED MAR. 6. I917.

Patented June 25, 1918.

fizz C me a? Q I Z W inders frequentl EMIL BORMAN, OF CHICAGO, ILLINOIB.

METHOD OF FILLIN G HOLES IN METAL PARTS.

Specification of Letters Patent.

Patented J une 25,- 1918.

Application filed March 6, 1917. Serial No. 152,682.

of Illinois, have invented or discovered a new and useful Method of Filling Holes in Metal Parts, of which the following is a specification.

Metal castings are frequently defective on account of having sand holes or blow holes therein. Frequently these defects do not appear until the casting has been machined, and a large amount of labor expended thereon. It is often desirable to fill up holes in castings or cylinders or the like in order to change the form of the same. Engine cylthese scores can e properly filled it avoids the necessity of boring out a cylinder and providing new pistons and rings. The present invention relates to means for filling in such holes and defects or scores with material of such hardness and relatively hi h melting point that the repaired article w ll be as good or substantiall as good as when new or as though no do eat had appeared therein. This invention is particularly applicable to repairing scored or defective cy lnders of internal combustion engines, where there is a high degree of temperature and the parts are subjected to consi erable wear.

The objects of the resent invention or discovery are to provi e a new and useful method of repairmg metal parts by filling holes with suitable metal so that the repaired art will be as. good or substantially as good as when in its original condition; to provide a method for repairing metal parts which includes a novel wa of preparing holes or recesses and then llin the holes or recesses with a comparatively ard metal or compound; toprovide a method of repairing engine cylinders or like articles,'havm such advantages as will appear more fu y from the following description.

In the accompanying drawings illustrating this invention igure 1 represents a' metal part, such for instance as an engine cylinder, havin different kinds of defects or injuries to e repaired; v

Fig. 2 is a cross sectional view on an enlarged scale, taken on the line 2-2, showing the defects after having been filled;

Fi 3 is a view similar to Fi 2, showing t e cylinder with the repair parts mabecome scored, and if chilled or finished to correspond with the internal wall of the cylinder.

Vhile my improved invention or discovery is adapted for filling various kinds of holes or recesses in metal parts, these drawings are illustrative of several repairs or corrections that may be made in accordance therewith. As illustrated in the drawing, 5 indicates a defect such as a sand hole, which only extends partially into the wall; 6 represents a defect such as a blow hole; and 7 represents a defect such as a score made in any well-known manner.

In repairing any of such defects, the hole or recess is first thoroughly cleaned of any loose dirt and is then prepared for filling by applying a cleaning liquid thereto, which thoroughly frees the walls of the opening from grease and the like and prepares the walls of the opening so that the filling material will adhere thereto. For this purpose I prefer to use a compound or li uid made in the followin manner: A given amount of zinc is disso ved or treated with approximately double the amount of muriatic or hydrochloric acid. This solution is then mixed with a relatively large volume of nitric acid and water, for instance in the following proportion: ten per cent. of the solution, and forty-five percent. each of The filling compound which I have preferred to use for filling holes in cast iron consists of the following: ten (10) per cent. of solderv composed of tin and lead, twentynine per cent. of bismuth, twenty-six per cent. of cobalt, and thirty-five per cent. of zinc. The elements and proportions in this compound ma of course be changed or varied to suit different conditions, but I have found that these metals combined in the proportions 'ven form a com ound which ma be readi ap lied to the efective part and which will ad ere to the prepared walls of the hole in cast iron so as to make a substantially permanent repair. Furthermore,

, in position in the hole or recess, su cient heat is applied thereto to keep the compound in a nearly molten condition and to heat the adjacent walls of the cylinder 11 or part being repaired. This heat may be applied in any desired manner, as by applying a heated iron or the like. Itis kept in this heated condition with the compound heated nearly to the melting point for about three to five minutes, and then allowed to cool. A suflicient amount of metal isapplied 'so that it projects outwardly from the surface, for instance as indicated in Fig. 2, so as to insure the complete filling of the hole or score. After this is done the filling is bored, machined or scraped away to leave a surface conforming to the surface of the cylinder or other part which is being treated, as indicated in Fig. 3, which shows the finished article. I have found that by using the particular cleaning compound above set forth, with the zinc dissolved therein, and then applying the filling compound made in the proportions above set forth, makes an exceedingly substantial patch or repair which is not afi'ected by any ordinary temperatures which are apt to be encountered, and the filling will remain in position even if the hole or scratch to be repaired is exceedingly shallow. It is possible that the cleaning liquid leaves the walls of the hole with a certain amount of zinc embedded or attached to the molecules of the-metal forming the wall, so j that when the molten compound is applied it will adhere or coalesce with the walls. In any event, the results obtained are as above set forth and the patch or repair will be sufiiciently hard so that it is nearly as hard as the walls of the casting. In removing the excess material I have found it advisable to use a tool formed of metal somewhat harder than the compound but not as hard as the Walls of the cylinder, so that the machining, scraping or finishing. tool will remove the excess compound without scratching the walls of the cylinder.

Having thus described my invention or discovery, which however I do not wish to limit to the exact proportions or compounds herein set forth, what I claim and desire to.

EMIL BORMAN. 

